openmusic-clipper

A node for clipping signals to a range

Signals in web audio are not clipped to -1, 1 until the very end i.e. when the output from the audio context's destination is sent to the sound card. You might want to clip them before that happens, so this module is for you!

You can use it for things such as:

• distorting sounds (the demo)
• creating more complex sounds out of simpler sounds

Using it

Create an audio context.

var audioContext = new AudioContext();

Require the code somehow:

var Clipper = require('openmusic-clipper');

or

<script src="Clipper.js"></script>

Then create instances by passing the context to the function:

var clipper = Clipper(audioContext);

And it's ready to be used!

// Just clip
var oscillator = audioContext.createOscillator();
var gain = audioContext.createGain();
gain.gain.setValueAtTime(5, audioContext.currentTime);
oscillator.connect(gain);
gain.connect(clipper);
clipper.connect(audioContext.destination);

// To clip out 25% of peak values set a different curve
clipper.setCurve([ -0.5, -0.5, 0, 0.5, 0.5 ]);

Demo

Run npm install first to have all the dependencies (i.e. the oscilloscope component) installed.

Then open index.html. Code is in demo.js.

** YOU NEED SUPPORT FOR WEB COMPONENTS IN YOUR BROWSER BECAUSE WE'RE NOT SHIMMING ANYTHING IN **

Firefox: go to about:config, find dom.webcomponents.enabled and set it to true.

Chrome: maybe nothing to do?